A flue gas recovery structure used for gas boiler

Abstract

The present invention discloses a flue gas recovery structure for gas boilers, which relates to the technical field of desulfurization, and includes a desulfurization tower, a bracket is fixedly connected to the bottom of the desulfurization tower, an air inlet pipe is connected to the lower part of one side of the desulfurization tower, a liquid retaining frame for preventing a desulfurizer from entering the air inlet pipe is fixedly connected to the top of the air inlet pipe, the liquid retaining frame is provided with circumferentially distributed drainage grooves and exhaust grooves, the drainage grooves and the exhaust grooves are alternately distributed, a fixed frame is fixedly connected to one side of the desulfurization tower close to the air inlet pipe, and a liquid inlet pipe is connected to the side of the desulfurization tower close to the air inlet pipe. The present invention arranges the air inlet pipe at the lower side of the desulfurization tower, guides the flue gas to flow upward from the middle, and cooperates with the upper liquid retaining frame to effectively prevent limestone slurry from directly entering the air inlet pipe, thereby reducing the risk of blockage, and at the same time, through the circumferentially distributed exhaust grooves, it helps the flue gas to be more evenly dispersed and discharged into the desulfurization tower.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurization, and in particular to a flue gas recovery structure used in a gas boiler. Background Art

[0002] Boiler flue gas contains acidic components, mainly because sulfur dioxide (SO2) and nitrogen oxides (NOx) produced during the combustion process react with water vapor to form sulfurous acid (H2SO3) and nitric acid (HNO3), causing the flue gas to become acidic. Therefore, limestone slurry is needed as a conventional desulfurizer to carry out wet desulfurization reaction on the sulfur dioxide in the flue gas to produce gypsum, and separate the sulfur dioxide from the flue gas, thereby achieving the purpose of removing sulfides. This process not only helps environmental protection, but the gypsum produced can also be reused as building materials, etc.

[0003] Traditional wet flue gas desulfurization systems mostly use the two-way flue gas inlet method at the bottom, that is, the flue gas enters from the two inlets at the bottom of the desulfurization tower, in order to avoid the limestone slurry directly flowing into the flue, thereby preventing the slurry from depositing or clogging in the flue. However, after the flue gas enters the desulfurization tower, due to the fluid mechanics characteristics (such as turbulence, laminar flow, etc.), the flue gas may be unevenly distributed in the desulfurization tower, and it is easy to form a local high-speed flow area. The flue gas with too fast flow rate fails to fully contact the absorbent (usually limestone slurry), resulting in reduced desulfurization efficiency.

[0004] Based on the above situation, the present invention proposes a flue gas recovery structure for a gas boiler. Summary of the invention

[0005] In order to overcome the disadvantage of uneven distribution of flue gas in a desulfurization tower, the present invention provides a flue gas recovery structure for use in a gas boiler.

[0006] A flue gas recovery structure used in gas boilers, including a desulfurization tower, a bracket is fixedly connected to the bottom of the desulfurization tower, an air inlet pipe is connected to the lower part of one side of the desulfurization tower, a liquid retaining frame for preventing a desulfurizer from entering the air inlet pipe is fixedly connected to the top of the air inlet pipe, the liquid retaining frame is provided with circumferentially distributed drainage grooves and exhaust grooves, the drainage grooves and the exhaust grooves are alternately distributed, a fixed frame is fixedly connected to one side of the desulfurization tower close to the air inlet pipe, a liquid inlet pipe is connected to one side of the desulfurization tower close to the air inlet pipe, a water pump is fixedly connected to the lower side of the desulfurization tower, a water pipe is fixedly connected to the other side of the desulfurization tower, and one side of the water pipe penetrates into The desulfurization tower is connected with the outlet of the water pump, and an upper and lower rotating frames are rotatably connected in the desulfurization tower. The rotating frames are fixedly connected with circumferentially distributed nozzles, and the other side of the water pipe penetrates into the desulfurization tower and is adjacent to the two rotating frames. An upper and lower guide plates are fixedly connected to the side of the water pipe close to the rotating frame. The upper guide plate is used to introduce the desulfurizer into the nozzle of the upper rotating frame, and the lower guide plate is used to introduce the desulfurizer into the nozzle of the lower rotating frame, and the upper and lower guide plates have opposite guide directions, so that the desulfurizer impacts the upper and lower rotating frames in opposite flow directions, thereby causing the two rotating frames to turn in opposite directions.

[0007] As a further preferred scheme, it also includes an electric turbine, which is installed at the bottom of the liquid blocking frame. A turntable is fixedly connected to the rotating shaft of the electric turbine, and the turntable is slidably connected to at least two push frames. The intake pipe is slidably connected to a blocking frame corresponding to the push frame, and the blocking frame is used to block the exhaust groove. A spring is fixedly connected between the blocking frame and the intake pipe, and an air guide frame is slidably connected in the exhaust groove, the blocking frame is in contact with the air guide frame, and the blocking frame is used to block each of the air guide frames.

[0008] As a further preferred solution, one side of the push frame close to the adjacent blocking frame is set as a curved surface, and one side of the blocking frame close to the adjacent push frame is set as an inclined surface, and the curved surface of the push frame is extruded and matched with the inclined surface of the adjacent blocking frame.

[0009] As a further preferred solution, it also includes a pull rod corresponding to the air guide frame, the pull rod is fixedly connected to the corresponding air guide frame, the air guide frame is fixedly connected with the pull rod, and the electric turbine is fixedly connected with a guide frame for guiding the pull rod.

[0010] As a further preferred solution, a hexagram groove for guiding and limiting the pull rod is formed on one side of the guide frame close to the pull rod.

[0011] As a further preferred scheme, it also includes a filter plate, which is fixedly connected to the side of the desulfurization tower close to the air inlet pipe. The inlet of the water pump is connected to a cooling cylinder, and the cooling cylinder is located inside the desulfurization tower. The air inlet pipe passes through the cooling cylinder from the side away from the water pump, and then passes through the cooling cylinder from the side close to the water pump. The side of the cooling cylinder close to the air inlet pipe is open, and a gap for the desulfurizer to flow is left between the air inlet pipe and the cooling cylinder.

[0012] As a further preferred solution, the filter holes of the filter plate are opened on the upper side, and the lower side of the filter plate is configured as a solid plate.

[0013] As a further preferred solution, the inner wall of the cooling cylinder is provided with circumferentially distributed guide grooves for guiding the desulfurizing agent.

[0014] As a further preferred solution, a rotating tube is also included, which is rotatably connected to a side of the liquid inlet pipe close to the filter plate, the outlet of the rotating tube faces the filter holes of the filter plate, and a torsion spring is fixedly connected between the rotating tube and the liquid inlet pipe.

[0015] As a further preferred solution, it also includes a shifting rod in a circular array with equal spacing, the shifting rod is fixedly connected to the rotating frame on the lower side, the rotating tube is fixedly connected with a protrusion, and the shifting rod intermittently contacts the protrusion when rotating.

[0016] The beneficial effects of the present invention are as follows: by arranging the air inlet pipe at the lower side of the desulfurization tower and guiding the flue gas to flow upward from the middle, and cooperating with the upper liquid retaining frame, the limestone slurry can be effectively prevented from directly entering the air inlet pipe, thereby reducing the risk of blockage. At the same time, the circumferentially distributed exhaust grooves can help the flue gas to be more evenly dispersed and discharged into the desulfurization tower.

[0017] The present invention uses the guiding effect of the upper and lower guide plates and the impact force of the limestone slurry to make the two upper rotating frames turn in opposite directions, so that the limestone slurry is sprayed in layers and in multiple directions. In this way, the limestone slurry can be mixed with the rising flue gas more evenly and fully. Compared with spraying in a single direction, the gas-liquid contact area and contact time can be greatly increased, thereby enhancing the efficiency of the desulfurization reaction.

[0018] The design of the present invention that allows the flue gas to flow from bottom to top through the air inlet pipe helps to form a more stable airflow field in the desulfurization tower, reduce eddy currents and short circuits, make the gas distribution in the entire desulfurization tower more uniform, and avoid the phenomenon of flue gas in local areas being discharged without being fully treated.

[0019] The present invention uses a water pump to re-pump the limestone slurry that is sprinkled on the liquid retaining frame and then flows to the lower part of the desulfurization tower through the drainage trough into the water pipe and sprays it out through the nozzle, thereby achieving the effect of evenly spraying the limestone slurry on the flue gas circulation and improving the desulfurization effect.

[0020] The more uniform and efficient gas-liquid reaction environment created by the present invention not only improves the removal rate of SO2, but also may promote the generation of purer and more crystalline gypsum by-products, which is beneficial to the subsequent resource recovery and utilization.

[0021] The present invention controls the automatic opening and closing of the baffle frame through an electric turbine, thereby controlling the amount of flue gas entering the desulfurization tower and avoiding potential safety hazards caused by excessive flue gas pressure. Moreover, when there is no flue gas or the flue gas flow is reduced, the baffle frame is controlled to close automatically, thereby effectively preventing materials in the desulfurization tower from flowing back into the air inlet pipe, thereby protecting upstream equipment from damage.

[0022] The present invention drives the air guide frame to intermittently move inward and outward along the exhaust groove through an electric turbine, so that the flue gas can be diffused quickly and more evenly in the desulfurization tower.

[0023] The present invention can cool down the high-temperature flue gas flowing in the air intake pipe through the limestone slurry in the cooling cylinder, which is beneficial to promote the chemical reaction between the limestone slurry and acidic gases such as sulfur dioxide, and improve the efficiency of the gas-liquid reaction in the desulfurization tower.

[0024] The invention sprays the limestone slurry to the filter holes of the filter plate in a directional manner through the rotating pipe, so that the limestone slurry flows into the cooling cylinder from the filter holes of the filter plate first, and the rotating pipe swings back and forth intermittently, so that the limestone slurry sprayed from the liquid inlet pipe is evenly impacted on the filter holes of the filter plate, thereby preventing the filter holes of the filter plate from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the air inlet pipe, the fixing frame and the liquid inlet pipe and other components of the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the water pipe, rotating frame, nozzle and guide plate of the present invention.

[0028] Figure 4 It is a three-dimensional structural schematic diagram of the electric turbine, turntable, push frame and other components of the present invention.

[0029] Figure 5 It is a three-dimensional structural schematic diagram of the retaining frame, spring, air guide frame and other components of the present invention.

[0030] Figure 6It is a three-dimensional structural schematic diagram of components such as the electric turbine, the air guide frame and the pull rod of the present invention.

[0031] Figure 7 It is a three-dimensional structural schematic diagram of components such as the air guide frame, the pull rod and the guide frame of the present invention.

[0032] Figure 8 It is a three-dimensional structural schematic diagram of the air intake pipe, filter plate, cooling cylinder and other components of the present invention.

[0033] Fig. 9 It is a schematic diagram of the three-dimensional structure of the cooling cylinder of the present invention.

[0034] Fig.10 It is a three-dimensional structural schematic diagram of the rotating tube, torsion spring, shift rod and other components of the present invention.

[0035] Fig.11 It is a three-dimensional structural schematic diagram of components such as the rotating tube, torsion spring and protrusion of the present invention.

[0036] Figure numbers: 1_desulfurization tower, 2_bracket, 3_inlet pipe, 301_liquid retaining frame, 302_drainage groove, 303_exhaust groove, 4_fixing frame, 5_liquid inlet pipe, 6_water pump, 7_water pipe, 8_rotating frame, 9_nozzle, 10_guide plate, 11_electric turbine, 12_turntable, 13_push frame, 131_retaining frame, 132_spring, 14_air guide frame, 15_pull rod, 16_guide frame, 17_filter plate, 18_cooling cylinder, 181_guide groove, 19_rotating pipe, 20_torsion spring, 21_shift lever, 22_bump. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0038] Embodiment 1: A flue gas recovery structure for a gas boiler, such as Figure 1-Figure 3As shown, it includes a desulfurization tower 1, a bracket 2 is fixedly connected to the bottom of the desulfurization tower 1, an air inlet pipe 3 for introducing flue gas is connected to the lower left side of the desulfurization tower 1, a liquid retaining frame 301 for preventing limestone slurry from entering the air inlet pipe 3 is fixedly connected to the top of the air inlet pipe 3, and circumferentially distributed drainage grooves 302 and exhaust grooves 303 are respectively opened on the upper and lower sides of the liquid retaining frame 301, the drainage grooves 302 and the exhaust grooves 303 are alternately distributed, and the groove length of the drainage grooves 302 is longer than the groove length of the exhaust grooves 303, the drainage grooves 302 are used to uniformly discharge the limestone slurry received on the liquid retaining frame 301, and the exhaust grooves 303 are used to uniformly discharge the flue gas in the air inlet pipe 3, the inner lower side of the desulfurization tower 1 is fixedly connected to a fixing frame 4 for fixing the air inlet pipe 3, the lower left side of the desulfurization tower 1 is connected to a liquid inlet pipe 5, and the liquid inlet pipe 5 is located above the air inlet pipe 3, a water pump 6 is fixedly connected to the lower inner side of the right side of the desulfurization tower 1, a water pipe 7 is fixedly connected to the right side of the desulfurization tower 1, the lower side of the water pipe 7 penetrates into the desulfurization tower 1 and is connected with the outlet of the water pump 6, an upper and lower rotating rack 8 is rotatably connected in the desulfurization tower 1, a plurality of circumferentially evenly distributed nozzles 9 are fixedly connected to the rotating rack 8, the upper side of the water pipe 7 penetrates into the desulfurization tower 1 and is adjacent to the two rotating racks 8, an upper and lower guide plates 10 are fixedly connected to the side of the water pipe 7 close to the rotating rack 8, the upper guide plate 10 is used to guide the limestone slurry into the nozzle 9 of the upper rotating rack 8, and the lower guide plate 10 is used to guide the limestone slurry into the nozzle 9 of the lower rotating rack 8, and the upper and lower guide plates 10 are directed in opposite directions, so that the limestone slurry impacts the upper and lower rotating racks 8 in opposite directions, thereby causing the two rotating racks 8 to turn in opposite directions.

[0039] When the present structure is used to desulfurize and recycle flue gas, flue gas and limestone slurry from the gas boiler are introduced into the air inlet pipe 3 and the liquid inlet pipe 5 respectively, so that the flue gas is evenly discharged into the desulfurization tower 1 from the exhaust groove 303, and the limestone slurry directly flows into the lower part of the desulfurization tower 1, and the water pump 6 is controlled to pump the limestone slurry into the water pipe 7, and then pumped upward to the upper and lower rotating racks 8. Under the guidance of the guide plates 10 on the upper and lower sides, the limestone slurry pumped out through the water pipe 7 impacts the rotating racks 8 on the upper and lower sides in opposite directions, so that the upper rotating rack 8 rotates clockwise. The rotating frame 8 on the lower side rotates counterclockwise, and the limestone slurry flows to the nozzle 9 and is evenly sprayed out. The liquid retaining frame 301 can prevent the limestone slurry from flowing back into the air inlet pipe 3. The limestone slurry sprayed through the nozzle 9 fully contacts the flue gas in the desulfurization tower 1. The gypsum generated by the reaction of the two settles at the bottom of the desulfurization tower 1. In this way, sulfur dioxide can be separated from the flue gas, thereby achieving the purpose of removing sulfide. The limestone slurry sprinkled on the liquid retaining frame 301 flows to the lower part of the desulfurization tower 1 through the drainage trough 302, and the water pump 6 then pumps it into the water pipe 7.

[0040] In summary, the present invention arranges the air inlet pipe 3 at the lower side of the desulfurization tower 1 and guides the flue gas to flow upward from the middle, and cooperates with the upper liquid retaining frame 301 to effectively prevent the limestone slurry from directly entering the air inlet pipe 3, thereby reducing the risk of blockage. At the same time, the circumferentially distributed exhaust grooves 303 help the flue gas to be more evenly dispersed and discharged into the desulfurization tower 1.

[0041] The present invention uses the guiding effect of the upper and lower guide plates 10 and the impact force of the limestone slurry to make the two upper rotating frames 8 turn in opposite directions, so that the limestone slurry is sprayed in layers and in multiple directions. In this way, the limestone slurry can be mixed with the rising flue gas more evenly and fully. Compared with spraying in a single direction, the gas-liquid contact area and contact time can be greatly increased, thereby enhancing the efficiency of the desulfurization reaction.

[0042] The design of the present invention that allows the flue gas to flow from bottom to top through the air inlet pipe 3 helps to form a more stable airflow field in the desulfurization tower 1, reduce eddy currents and short circuits, make the gas distribution in the entire desulfurization tower 1 more uniform, and avoid the phenomenon that the flue gas in a local area is discharged without being fully treated.

[0043] The present invention uses a water pump 6 to re-pump the limestone slurry that is sprinkled on the liquid retaining frame 301 and then flows to the lower part of the desulfurization tower 1 through the drainage trough 302 into the water pipe 7 and sprays it out through the nozzle 9, thereby achieving the effect of evenly spraying the limestone slurry on the flue gas circulation and improving the desulfurization effect.

[0044] The more uniform and efficient gas-liquid reaction environment created by the present invention not only improves the removal rate of SO2, but also may promote the generation of purer and more crystalline gypsum by-products, which is beneficial to the subsequent resource recovery and utilization.

[0045] Embodiment 2: Based on embodiment 1, Figure 4 and Figure 5As shown, it also includes an electric turbine 11, which is installed at the bottom of the liquid retaining frame 301. The electric turbine 11 is located in the air intake pipe 3. A turntable 12 is fixedly connected to the rotating shaft of the electric turbine 11. The turntable 12 is slidably connected to two push racks 13 in the left and right directions. When the electric turbine 11 drives the turntable 12 to rotate at a high speed, the two push racks 13 move away from each other under the action of centrifugal force. The upper part of the air intake pipe 3 is slidably connected to a retaining frame 131 corresponding to the push rack 13 in the up and down directions. The push rack 13 is close to the adjacent retaining frame 131. One side of the baffle 131 is set as a curved surface, and the side of the baffle 131 close to the adjacent push frame 13 is set as an inclined surface. The curved surface of the push frame 13 is squeezed and matched with the inclined surface of the adjacent baffle 131. A spring 132 is fixedly connected between the baffle 131 and the air inlet pipe 3. An air guide frame 14 is slidably connected in the exhaust groove 303. The top protrusions of the baffle 131 are respectively used to block each air guide frame 14. The air guide frame 14 can extend the smoke outlet position on the basis of the exhaust groove 303 to avoid smoke accumulation in the exhaust groove 303 and accelerate the diffusion of smoke.

[0046] When the flue gas is introduced into the air intake pipe 3, the electric turbine 11 is started at the same time. The rotation of the electric turbine 11 drives the turntable 12 to rotate at a high speed. Under the action of centrifugal force, the two push frames 13 slide away from each other until the push frames 13 contact the adjacent blocking frames 131. Under the squeezing effect of the push frames 13, the blocking frames 131 move downward and separate from the air guide frame 14, and the spring 132 is compressed, so that the flue gas in the air intake pipe 3 can be discharged.

[0047] When the flue gas is stopped from being introduced into the air intake pipe 3, the electric turbine 11 is closed at the same time. At this time, the push frame 13 is no longer affected by the centrifugal force. At this time, under the reset action of the spring 132, the blocking frame 131 moves upward to squeeze the push frame 13, so that the two push frames 13 slide and reset in the direction of approaching each other, and the blocking frame 131 moves upward to contact with the air guide frame 14, so that the flue gas in the air intake pipe 3 cannot be discharged. In this way, the amount of flue gas entering the desulfurization tower 1 can be controlled to avoid safety hazards caused by excessive flue gas pressure, and when there is no flue gas or the flue gas flow is reduced, the blocking frame 131 can be controlled to close automatically, thereby effectively preventing the substances in the desulfurization tower 1 from flowing back into the air intake pipe 3, protecting the upstream equipment from damage.

[0048] like Figure 6 and Figure 7 As shown, it also includes a pull rod 15 corresponding to the air guide frame 14, the pull rod 15 is fixedly connected to the corresponding air guide frame 14, the rotating shaft of the electric turbine 11 is fixedly connected with a guide frame 16 for guiding the pull rod 15, and the top side of the guide frame 16 is provided with a plum blossom groove for guiding and limiting the pull rod 15.

[0049] When the electric turbine 11 rotates, it drives the guide frame 16 to rotate. The guide frame 16 drives the pull rod 15 to move intermittently inward and outward through the plum blossom groove, thereby driving the air guide frame 14 to move intermittently inward and outward along the exhaust groove 303. In this way, the flue gas can diffuse quickly and evenly in the desulfurization tower 1.

[0050] Embodiment 3: Based on embodiment 2, Figure 8 and Fig. 9 As shown, it also includes a filter plate 17, which is fixed to the lower left side of the desulfurization tower 1, and the filter holes of the filter plate 17 are opened on the upper side. The lower side of the filter plate 17 is set as a solid plate for isolating the settled gypsum. The inlet of the water pump 6 is connected to the cooling cylinder 18, and the cooling cylinder 18 is located inside the desulfurization tower 1. The air inlet pipe 3 penetrates from the left side of the cooling cylinder 18 and then passes through the upper right part of the cooling cylinder 18. The left side of the cooling cylinder 18 is open, and a gap for the circulation of limestone slurry is left between the air inlet pipe 3 and the cooling cylinder 18. The inner wall of the cooling cylinder 18 is provided with circumferentially distributed guide grooves 181 for guiding the limestone slurry.

[0051] When the water pump 6 extracts limestone slurry, the gypsum solids that sink to the bottom may be sucked in by the water pump 6, which makes the water pump 6 easily blocked. To avoid this situation, a filter plate 17 is set so that the limestone slurry flows to the left side of the filter plate 17 alone, and the gypsum is isolated on the right side by the filter plate 17. The limestone slurry then enters through the left end of the cooling tube 18 and flows to the right side of the cooling tube 18 along the guide groove 181. The water pump 6 directly extracts the limestone slurry from the cooling tube 18. At the same time, when the flue gas flowing in the intake pipe 3 passes through the cooling tube 18, the limestone slurry in the cooling tube 18 can cool the high-temperature flue gas, which is beneficial to promote the chemical reaction between the limestone slurry and acidic gases such as sulfur dioxide, and improve the efficiency of the gas-liquid reaction in the desulfurization tower 1.

[0052] Embodiment 4: Based on embodiment 3, Fig.10 and Fig.11 As shown, it also includes a rotating tube 19, which is rotatably connected to the side of the liquid inlet pipe 5 close to the filter plate 17, and the outlet of the rotating tube 19 faces the filter holes of the filter plate 17. A torsion spring 20 is fixedly connected between the rotating tube 19 and the liquid inlet pipe 5. The rotating frame 8 on the lower side is fixedly connected to six shifting rods 21 in a circular array with equal spacing. The rotating tube 19 is fixedly connected to a protrusion 22, and the shifting rod 21 intermittently contacts the protrusion 22 when rotating.

[0053] The limestone slurry entering the liquid inlet pipe 5 is directedly sprayed to the filter holes of the filter plate 17 through the rotating tube 19, so that the limestone slurry preferentially flows into the cooling cylinder 18 from the filter holes of the filter plate 17. Moreover, when the rotating frame 8 on the lower side rotates, the lever 21 is driven to rotate. When the lever 21 contacts the protrusion 22, the lever 21 drives the rotating tube 19 to rotate by shifting the protrusion 22, and the torsion spring 20 is deformed. When the lever 21 is disengaged from the protrusion 22, the torsion spring 20 is reset to drive the rotating tube 19 to reverse and reset. The rotating tube 19 intermittently swings back and forth, thereby evenly impacting the limestone slurry sprayed from the liquid inlet pipe 5 onto the filter holes of the filter plate 17 to prevent the filter holes of the filter plate 17 from being blocked.

[0054] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A flue gas recovery structure for a gas boiler, comprising a desulfurization tower (1), a bracket (2) being fixedly connected to the bottom of the desulfurization tower (1), and an air inlet pipe (3) being connected to the lower part of one side of the desulfurization tower (1), wherein: A liquid retaining frame (301) for preventing the desulfurizing agent from entering the air intake pipe (3) is fixedly connected to the top of the air intake pipe (3); the liquid retaining frame (301) is provided with circumferentially distributed drainage grooves (302) and exhaust grooves (303); the drainage grooves (302) and the exhaust grooves (303) are alternately distributed; a fixing frame (4) is fixedly connected to the inner side of the desulfurization tower (1) close to the air intake pipe (3); a liquid inlet pipe (5) is connected to the inner side of the desulfurization tower (1) close to the air intake pipe (3); a water pump (6) is fixedly connected to the lower side of the desulfurization tower (1); a water pipe (7) is fixedly connected to the other side of the desulfurization tower (1); one side of the water pipe (7) penetrates into the desulfurization tower (1) and is connected to the outlet of the water pump (6); Two upper and lower rotating frames (8) are rotatably connected in the desulfurization tower (1), and the rotating frames (8) are fixedly connected with nozzles (9) distributed in a circumferential direction. The other side of the water pipe (7) penetrates into the desulfurization tower (1) and is adjacent to the two rotating frames (8). The side of the water pipe (7) close to the rotating frames (8) is fixedly connected with two upper and lower guide plates (10). The upper guide plate (10) is used to guide the desulfurizer into the nozzle (9) of the upper rotating frame (8), and the lower guide plate (10) is used to guide the desulfurizer into the nozzle (9) of the lower rotating frame (8). The upper and lower guide plates (10) have opposite directions of guidance, so that the desulfurizer impacts the upper and lower rotating frames (8) in opposite directions, thereby causing the two rotating frames (8) to turn in opposite directions. The invention also comprises an electric turbine (11), wherein the electric turbine (11) is mounted on the bottom of the liquid retaining frame (301), a rotating disk (12) is fixedly connected to the rotating shaft of the electric turbine (11), the rotating disk (12) is slidably connected to at least two push frames (13), the air intake pipe (3) is slidably connected to a retaining frame (131) corresponding to the push frame (13), the retaining frame (131) is used to retain the exhaust groove (303), a spring (132) is fixedly connected between the retaining frame (131) and the air intake pipe (3), an air guide frame (14) is slidably connected in the exhaust groove (303), the retaining frame (131) is in contact with the air guide frame (14), and the retaining frame (131) is used to retain each of the air guide frames (14).

2. A flue gas recovery structure for a gas boiler according to claim 1, characterized in that: A side of the push frame (13) close to the adjacent blocking frame (131) is configured as a curved surface, a side of the blocking frame (131) close to the adjacent push frame (13) is configured as an inclined surface, and the curved surface of the push frame (13) is extruded and matched with the inclined surface of the adjacent blocking frame (131).

3. A flue gas recovery structure for a gas boiler according to claim 2, characterized in that: It also includes a pull rod (15) corresponding to the air guide frame (14), the pull rod (15) is fixedly connected to the corresponding air guide frame (14), the air guide frame (14) is fixedly connected to the pull rod (15), and the electric turbine (11) is fixedly connected to a guide frame (16) for guiding the pull rod (15).

4. A flue gas recovery structure for a gas boiler according to claim 3, characterized in that: A hexagram groove for guiding and limiting the pull rod (15) is formed on one side of the guide frame (16) close to the pull rod (15).

5. A flue gas recovery structure for a gas boiler according to claim 4, characterized in that: The desulfurization tower (1) further comprises a filter plate (17), the filter plate (17) being fixedly connected to a side of the desulfurization tower (1) near the air inlet pipe (3), the inlet of the water pump (6) being connected to a cooling cylinder (18), the cooling cylinder (18) being located inside the desulfurization tower (1), the air inlet pipe (3) passing through a side of the cooling cylinder (18) away from the water pump (6), and then passing through a side of the cooling cylinder (18) near the water pump (6), the side of the cooling cylinder (18) near the air inlet pipe (3) being open, and a gap for the desulfurization agent to flow is left between the air inlet pipe (3) and the cooling cylinder (18).

6. A flue gas recovery structure for a gas boiler according to claim 5, characterized in that: The filter holes of the filter plate (17) are opened on the upper side, and the lower side of the filter plate (17) is configured as a solid plate.

7. A flue gas recovery structure for a gas boiler according to claim 6, characterized in that: The inner wall of the cooling cylinder (18) is provided with circumferentially distributed guide grooves (181) for guiding the desulfurizing agent.

8. A flue gas recovery structure for a gas boiler according to claim 7, characterized in that: The invention also comprises a rotating tube (19), wherein the rotating tube (19) is rotatably connected to a side of the liquid inlet tube (5) close to the filter plate (17), the outlet of the rotating tube (19) faces the filter holes of the filter plate (17), and a torsion spring (20) is fixedly connected between the rotating tube (19) and the liquid inlet tube (5).

9. A flue gas recovery structure for a gas boiler according to claim 8, characterized in that: It also includes a shifting rod (21) in a circular array with equal spacing, wherein the shifting rod (21) is fixedly connected to the rotating frame (8) on the lower side, and the rotating tube (19) is fixedly connected with a protrusion (22), and the shifting rod (21) intermittently contacts the protrusion (22) when rotating.

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